Hitoyoshi Basin

Japanese: 人吉盆地 - ひとよしぼんち
Hitoyoshi Basin

A structural basin formed by a spindle-shaped fault running roughly east-west in the southern part of Kumamoto Prefecture, at the junction of the northern and southern Kyushu mountains. It has an area of ​​about 72 square kilometers and an elevation of 100 to 200 meters. On either side of the Kuma River, which flows east-west through the center of the basin, is a plateau of composite alluvial fans and terraces in the southern part, and hills of Aso welded tuff in the northern part. Both were first cultivated by the introduction of water. In particular, the Hyakutaro Ditch and Kounomi Ditch, which were excavated for over a century from the end of the 16th century, contributed greatly to the development of rice paddies in the southern part. The basin area includes Hitoyoshi City and four other towns and three villages, and Hitoyoshi City, which occupies the western part of the area, is the economic and cultural center of the Kuma region. It is served by the JR Hisatsu Line, the Kuma River Railway, National Route 219, and the Kyushu Expressway, and has the Hitoyoshi Interchange.

[Yamaguchi Morito]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

熊本県南部、九州山地北部と南部の縫合部に生じたほぼ東西方向に紡錘状の形をなす断層による構造盆地。面積約72平方キロメートル、標高100~200メートル。盆底の中央を東西に流れる球磨川(くまがわ)を挟み、南部には複合扇状地・段丘からなる台地、北部には阿蘇(あそ)溶結凝灰岩からなる丘陵がみられ、いずれも導水によって耕地化が初めて可能になった。とくに南部の開田化には16世紀末から1世紀以上にわたって掘削の続けられた百太郎溝(ひゃくたろうみぞ)、幸野溝(こうのみぞ)が大きく寄与している。盆地域には人吉市ほか4町3か村があり、なかでも西部を占める人吉市は球磨地方の経済、文化の中心である。JR肥薩(ひさつ)線、くま川鉄道、および国道219号、九州自動車道が通じ、人吉インターチェンジがある。

[山口守人]

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